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Microstructures resulting from the interaction between ferrite recrystallization and austenite formation in dual-phase steels

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Abstract

The present work investigates the interactions between ferrite recrystallization and austenite formation in dual-phase steels by experiments performed at high heating rate (100 °C/s). It was shown that both ferrite recrystallization and austenite formation are strongly coupled and interdependent. The kinetics of ferrite recrystallization is strongly affected by the formation of austenite and can be even inhibited in some cases. The microstructure is more heterogeneous and anisotropic when both the austenite formation and the ferrite recrystallization overlap. It was highlighted that the degree of anisotropy depends on the volume fraction of austenite at a given temperature. Furthermore, an unusual behavior for austenite growth was highlighted. It is characterized by a much higher volume fraction than those obtained under OrthoEquilibrium and ParaEquilibrium. The results, especially those at 715 °C close to the eutectoid plateau, at which the driving force for austenite growth is classically low, suggest a diffusionless transformation for austenite.

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Authors and Affiliations

  1. Arcelormittal Maizières Research SA, Voie Romaine, BP 30302, 57283, Maizières Les Metz, France

    D. Barbier & A. Chbihi

  2. Laboratoire d’Étude des Microstructures et de Mécanique des Matériaux (LEM3), UMR CNRS 7239, Université de Lorraine - Île du Saulcy, 57045, Metz Cedex 1, France

    L. Germain, A. Hazotte & A. Chbihi

  3. DAMAS, Key Laboratory for Design of Alloy Metals for low-mAss Structures, Université de Lorraine, Nancy, France

    L. Germain & A. Hazotte

  4. ICMCB Bordeaux – UPR CNRS 9048I, 87 Avenue du Docteur Schweitzer, 33608, Pessac, France

    M. Gouné

Authors
  1. D. Barbier
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  2. L. Germain
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  3. A. Hazotte
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  4. M. Gouné
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  5. A. Chbihi
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Correspondence to L. Germain.

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Barbier, D., Germain, L., Hazotte, A. et al. Microstructures resulting from the interaction between ferrite recrystallization and austenite formation in dual-phase steels. J Mater Sci 50, 374–381 (2015). https://doi.org/10.1007/s10853-014-8596-2

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  • DOI: https://doi.org/10.1007/s10853-014-8596-2

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